<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        /* 先请求A 再请求B 再请求C */


        function getUser() {
            return new Promise((resolve, reject) => {
                console.log("A数据开始请求....")
                try {
                    // throw new Error("A错误")
                    setTimeout(() => {
                        console.log("A数据请求成功");
                        const user = {
                            username: "laoliu"
                        }
                        resolve(user)
                    }, 2000)
                } catch (e) {
                    reject(e.message)
                }
            });
        }

        function getSex(user) {
            return new Promise((resolve, reject) => {
                console.log("B数据开始请求....")
                try {
                    // throw new Error("B错误")
                    setTimeout(() => {
                        console.log("B数据请求成功");
                        const sex = {
                            sex: "男"
                        }
                        resolve({
                            ...user,
                            ...sex
                        })
                    }, 2000)
                } catch (e) {
                    reject(e.message)
                }
            });
        }

        function getAge(sex) {
            return new Promise((resolve, reject) => {
                console.log("C数据开始请求....")
                try {
                    // throw new Error("C错误")
                    setTimeout(() => {
                        console.log("C数据请求成功");
                        const age = {
                            age: 18
                        }
                        resolve({
                            ...sex,
                            ...age
                        })
                    }, 2000)
                } catch (e) {
                    reject(e.message)
                }
            });
        }


        async function getData() {
            const user = await getUser();

            const sex = await getSex(user);

            const age = await getAge(sex);

            //最后异步的操作 我们可以不用await 也会最后执行
            console.log("完整的数据是", age);

        }


        getData()
    </script>
</body>

</html>